Robot arm



FIG. 1 is a perspective view of the robot arm;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a schematic drawing showing that the robot arm of the present design is in use.

The broken lines in the drawings depict unclaimed environmental subject matter. 

CLAIM The ornamental design for a robot arm, as shown and described. 